package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;

    /*
    * 新增套餐
    * */
    @Override
    @Transactional
    public void saveWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);
        //向套餐中加入数据
        setmealMapper.insert(setmeal);
        //获取生成的ID，联查数据
        Long setmealId = setmeal.getId();
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> setmealDish.setSetmealId(setmealId));
        //保存关联关系
        setmealDishMapper.insertBatch(setmealDishes);

    }
/*
* 套餐的分页查询
* */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        int pageNum = setmealPageQueryDTO.getPage();
        int pageSize = setmealPageQueryDTO.getPageSize();
        PageHelper.startPage(pageNum,pageSize);
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /*
    * 批量删除套餐
    * */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        ids.forEach(id ->{
            Setmeal setmeal = setmealMapper.getById(id);
            if(StatusConstant.ENABLE == setmeal.getStatus()){
                // 套餐正在启用，售卖中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });
        ids.forEach(setmealId -> {
//          删除套餐表中的数据
            setmealMapper.deleteById(setmealId);
//          删除套餐中菜品关系表中的数据
            setmealDishMapper.deleteBySetmealId(setmealId);
        });
    }
/*
* 根据id查询套餐和套餐菜品关系
* */
    @Override
    public SetmealVO getByIdWithDish(Long id) {
        SetmealVO setmealVO = setmealMapper.getByIdWithDish(id);
        return setmealVO;
    }

    /*
    * 套餐修改
    * */
    @Override
    @Transactional
    public void update(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);

        // 1、修改套餐表，执行update
        setmealMapper.update(setmeal);
        // 套餐id
        Long setmealId = setmealDTO.getId();
        // 2、删除套餐中菜品关系表中的数据
        setmealDishMapper.deleteBySetmealId(setmealId);
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });
        // 3、添加套餐中菜品关系表中的数据
        setmealDishMapper.insertBatch(setmealDishes);

    }

    /*
    * 套餐起售、停售
    * */
    @Override
    public void startOrStop(Integer status, Long id) {
        // 起售套餐时，需要判断套餐内是否有停售菜品，如果有，则提示无法售卖
        if(status == StatusConstant.ENABLE){
            // select a.* from dish a left join setmeal_dish b on a.id= b.dish_id where b.setmeal_id = ?
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if(dishList != null && dishList.size() > 0){
                dishList.forEach(dish -> {
                    if(StatusConstant.DISABLE == dish.getStatus()){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }
        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }

    /*
    * 查询套餐
    * */
    @Override
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /*
    * 根据id查询菜品列表
    * */
    @Override
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
